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 Basic join or select question
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Starting Member

16 Posts

Posted - 11/12/2012 :  17:15:13  Show Profile  Reply with Quote
i have 2 tables like this
X {id, value1}

X data
1 1500
2 400
3 100
4 1000
5 400

Y data
1 1 200
2 1 400
3 3 100
4 2 100

How should i make join query that return
1 1500 600 900
2 400 100 300
3 100 100 0
4 1000 0 1000
5 400 0 400

Which basicaly is
1) x.idx, 2)x.value, 3)sum(value2 from y where y.idx=x.id), 4) 2)-3)

which query is faster ?

select id ,value , select(sum(value2) from y where y.idx=x.id) as sums, value - sums from x
or the join query i ask you to create.


Bustaz Kool
Flowing Fount of Yak Knowledge

1815 Posts

Posted - 11/12/2012 :  19:55:13  Show Profile  Reply with Quote
select x.id, x.value1, sum(y.value2), x.value1 - sum(y.value2)
from x
inner join y
  on x.id = y.idx
group by
  x.id, x.value1
Having the subquery in the SELECT caluse, as you have done it, would probably have the subquery execute for every record returned and therefore would be slower. The SQL Engine might be smart enough to figure out what you have done and fix things under the covers but it might not.

We are far more concerned about the desecration of the flag than we are about the desecration of our land. -Wendell Berry
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Starting Member

16 Posts

Posted - 11/19/2012 :  15:42:04  Show Profile  Reply with Quote
but as i use inner join then in output i do not have line 4 coouse it do not have any records in Y table. and i neeed to have all records from table X despite of any records for it in Y.
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Flowing Fount of Yak Knowledge

7174 Posts

Posted - 11/19/2012 :  15:54:58  Show Profile  Reply with Quote
You mean this one:

Select x.id,x.Value1,YSUM,ISNULL(Value1,0) - YSUM
from x
inner join
Select x.id,SUM(isnull(y.value2,0))YSUM
from x
left join y on x.id = y.idx
group by x.id
)y on x.id = y.id
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Very Important crosS Applying yaK Herder

52325 Posts

Posted - 11/20/2012 :  01:50:26  Show Profile  Reply with Quote

SELECT m.id,m.value1,COALESCE(n.Tot,0) AS Tot,m.value1-COALESCE(n.Tot,0) AS Res
FROM x m
LEFT JOIN (SELECT idx,SUM(value2) AS Tot
           FROM y
           GROUP BY idx
ON n.idx = m.id

SQL Server MVP

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